JPH0440827Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention automatically rotates parts such as bolts, screws, and rivets one by one using a drive bit that rotates under the rotation of a rotary drive source such as a motor. This article relates to an automatic parts fastening machine for fastening parts.

[Conventional technology]

2. Description of the Related Art Conventionally, there has been an automatic bolt fastening machine as shown in FIG. 3 as a device for reliably fastening parts by absorbing misalignment between the drive bit of the automatic parts fastening machine and the working position of a workpiece. This automatic bolt fastening machine has a driver stand 6 that is reciprocated by the operation of a first cylinder (not shown) that is horizontally fixed to a table (not shown). A first guide sleeve 31 is fixed to the driver stand 6 via a spacer 33, and a rotary drive source 9 is fixed to the first guide sleeve 31 with its drive shaft contained therein. A grooved sleeve 12 is connected to the drive shaft so as to rotate together with the grooved sleeve 12, and a connecting shaft 14 having a tapered portion 14d and a small diameter portion 14b is fitted into the grooved sleeve 12 so as to be relatively movable. ing. Further, the grooved sleeve 12 has a guide groove 1.
3 is cut out, and the pin 20 implanted in the connecting shaft 14 is positioned so that the grooved sleeve 12 and the connecting shaft 14 rotate together.
Furthermore, the connecting shaft 14 is urged forward by a spring 21 housed in the grooved sleeve 12, and is configured to be retractable. Further, the connecting shaft 14
The tapered portion 14d of the first guide sleeve 31
The grooved sleeve 12 is configured to be rotatable at its distal end and positioned within a second guide sleeve 32 fixed to the distal end of the grooved sleeve 12. Moreover, the tapered portion 14d and the small diameter portion 14b abut on the tapered hole 32a and the guide hole 32b of the second guide sleeve 32, respectively, to center the connecting shaft 14, and
4 is configured to be rotatably held in that position. A box bit 15 is connected to the connecting shaft 14, and the box bit 15 is configured to rotate together with the rotation of the rotary drive source 9.

[Problem that the invention attempts to solve]

In the above-mentioned automatic bolt fastening machine, the driver stand 6 moves forward by the operation of the first cylinder, and the box bit 15 moves forward together with this and comes into contact with the bolt 25 temporarily tightened to the workpiece 24, and the connecting shaft 14 is moved by the spring 21. Retreat relative to the enemy. At this time, the tapered portion 14d of the connecting shaft 14 is connected to the second guide sleeve 3.
2 from the tapered hole 32a, and further the small diameter portion 1
4b is removed from the guide hole 32b of the second guide sleeve 32, and the connecting shaft 14 becomes swingable.
In this state, the connecting shaft 14 and box bit 1
5 rotates under rotation, the connecting shaft 14 and the box bit 15 can tilt about the pin 20. Therefore, even if the working positions of the box bit 15 and the workpiece 24 are misaligned, the box bit 15 can be fitted with the head of the bolt 25.
The bolt 25 can be tightened.

After this tightening is completed, when the first cylinder moves back, the spring 21
The first guide sleeve 31 and the second
Only the guide sleeve 32 and the grooved sleeve 12 move. Therefore, the tapered portion 1 of the connecting shaft 14
4d and the small diameter portion 14b are the second guide sleeve 3
The box bit 15 is moved forward relative to the tapered hole 32a and the guide hole 32b of No. 2 and fitted into these, thereby centering the box bit 15 and detaching the box bit 15 from the bolt 25. At this time, the box bit 15 and bolt 25 are in a biting state,
Moreover, the connecting shaft 14, which is integral with the box bit 15, is in an inclined state. Therefore, when the connecting shaft 14 comes into contact with the second guide sleeve 32 and centering of the connecting shaft 14 is performed, the connecting shaft 14 and the box bit 15 receive a force in the direction of standing upright, and the connecting shaft 14
4 and the box bit 15 are twisted between the second guide sleeve 32 and the head of the bolt 25.
In this state, the connecting shaft 14 and box bit 1
5 further returns to its original position, resulting in disadvantages such as damage to the head of the box bit 15 or bolt 25.

[Means for solving problems]

The present invention is aimed at eliminating the above-mentioned drawbacks, and includes a driver stand and a guide sleeve that are moved forward together by the operation of the first cylinder.
A rotary drive source is fixed to this driver stand, and a grooved sleeve having a guide groove is connected to this drive shaft so as to rotate together with the drive shaft. A connecting shaft having a guide portion at the tip and a small diameter portion continuous to the guiding portion is loosely inserted into the grooved sleeve so as to be movable in the axial direction, and the grooved sleeve and the connecting shaft are connected to the grooved sleeve. are rotatably connected together by a guide pin located in a guide groove. Furthermore, the connecting shaft is urged forward by a spring and is configured to be retractable. Furthermore, a drive bit is connected to the connecting shaft and is configured to tighten parts placed at predetermined positions.

On the other hand, the guide sleeve is disposed so as to enclose the grooved sleeve, and the guide sleeve is configured to guide and rotatably hold the guide portion of the connecting shaft. Further, the guide sleeve and the driver stand are connected by a second cylinder, and the distance between them is configured to be extendable. Moreover, this second cylinder is connected to an air control circuit that operates when the first cylinder moves backward, and the second cylinder operates simultaneously with the backward movement of the first cylinder to advance the guide sleeve relative to the connecting shaft. It is configured to allow

[Effect]

In the automatic parts fastening machine described above, when the first cylinder is activated and the drive bit comes into contact with the part and the connecting shaft retreats relatively, the guide part of the connecting shaft separates from the guide sleeve, and the connecting shaft and the driving bit swing. It becomes possible. Therefore, even if the drive bit and the part temporarily fastened to the workpiece are positioned slightly misaligned,
As the articulating shaft and the drive bit rotate, the drive bit tilts until it can engage the part and clamp the part to the workpiece.

After the parts have been tightened, when the first cylinder moves back, the spring expands by the amount that was deflected during tightening, and the connecting shaft returns to its original position relative to the grooved sleeve.
The drive shaft, connecting shaft and drive bit are returned together. At the same time, the second cylinder is operated, the distance between the driver stand and the guide sleeve is widened, and the guide sleeve is moved forward relative to the articulating shaft. Therefore, the connecting shaft does not match the guide sleeve, the connecting shaft and the driving bit can maintain an inclined posture, and the connecting shaft and the driving bit will not be crushed. Even if the driver stand returns to its original position in this state, it will not cause damage to the drive bit or any parts.

〔Example〕

Examples will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a base fixed to a table 2, and two linear rails 4 are fixed horizontally and in parallel to the base 1 with spacers 3 interposed therebetween. Two linear bearings 5a and 5b are slidably arranged on this linear rail 4, and a driver stand 6 is fixed to one of the linear bearings 5a. This driver stand 6 has the base 1
A rod 8a of a first cylinder 8 is fixed through a fixture 7, and the driver stand 6 is configured to move forward by the operation of the first cylinder 8. Further, a rotary drive source 9 extending in the horizontal direction is fixed to the driver stand 6, and the drive shaft thereof is configured to stop rotating when a predetermined torque is reached and continue to maintain that torque. . Further, the drive shaft is located passing through the driver stand 6, and an intermediate shaft 11a arranged in parallel with the drive shaft is connected to the tip of the drive shaft via a gear mechanism 11 housed in a gear case 10. There is. A grooved sleeve 1 is provided at the lower end of this intermediate shaft 11a.
2 is fixed, and the tip of this grooved sleeve 12 has a rod portion in which a guide groove 13 consisting of a straight groove 13a and an inclined groove 13b is cut. A box bit 15 forming a driving bit is connected to the box bit.

On the other hand, a mounting plate 1 is attached to the other linear bearing 5b at a predetermined distance from the driver stand 6.
6 is fixed, and a second cylinder 17 is fixed to this mounting plate 16 in the direction in which the rotational drive source 9 extends. The driver stand 6 is connected to the rod 17a of the second cylinder 17 via a connecting rod 18, and the mounting plate 16 is connected to the rod 17a of the second cylinder 17.
It is configured so that the distance can be extended. The mounting plate 16 also has a tapered hole 19 at its tip.
Guide sleeve 1 having a guide hole 19b and a guide hole 19b
9 is fixed, and the connecting shaft 14 is disposed within the guide sleeve 19. The connecting shaft 14 has a guide portion 14c that connects the large diameter portion 14a and the small diameter portion 14b, and the guide portion 14
c is configured to reach a position where it is guided by the guide hole 19b of the guide sleeve 19. The large diameter portion 14a of the connecting shaft 14 is loosely inserted so as to enclose the rod portion of the grooved sleeve 12, and is configured to be slidable in the axial direction thereof. Moreover,
A pin 20 is implanted in the large diameter portion 14a, and this pin 20 is positioned within the guide groove 13 of the grooved sleeve 12, so that the grooved sleeve 12 and the connecting shaft 14 can rotate together. has been done. Further, a spring 21 is disposed between the connecting shaft 14 and the flange of the grooved sleeve 12, and the spring 21 urges the connecting shaft 14 toward the forward direction, thereby pushing the connecting shaft 14 toward the guide portion 14c. is positioned in the guide hole 19b of the guide sleeve 19 so that its guiding distance is shorter than the retracting distance of the connecting shaft 14.

Furthermore, a sensor 23 is fixed to the tip of the guide sleeve 19 via a fitting 22,
This sensor 23 is configured to detect the approach of the box bit 15 and to detect the rearward end of the connecting shaft 14. Further, the air control circuit for the first cylinder 8 supplies air to the first cylinder 8 by a work start switch (not shown), and reverses the air supply direction in response to a signal from the sensor 23. Another sensor (not shown), which is activated when the cylinder 8 moves back and the driver base 6 returns to its original position, is configured to stop its air supply. Furthermore, the second cylinder 1
The air control circuit 7 supplies air to the second cylinder 17 based on the signal from the sensor 23 to operate the second cylinder 17, and the other sensor (not shown) stops the air supply. It is configured.

In the above-mentioned automatic parts fastening machine, as shown in FIG. As the box bit 15 moves forward and comes into contact with the bolt 25, the box bit 1
The guide portion 14c of the connecting shaft 14 and the guide sleeve 19, which perform centering of the joint shaft 5, are separated and become swingable. When the box bit 15 rotates in this state, the connecting shaft 14 and the box bit 15 tilt as shown in FIG. 2b, and the head of the bolt 25 fits into the box hole 15a.
5 is screwed into the workpiece 24 at a predetermined position.

When the first cylinder 8 moves back and the grooved sleeve 12 begins to return together with the driver stand 6, the guide shaft 13 of the grooved sleeve 12 retreats with respect to the connecting shaft 14. Therefore, the guide groove 13 is connected to the connecting shaft 1.
4, and the pin 20 is pushed by the side wall of the inclined groove 13b of the guide groove 13 and rotates in the opposite direction to the tightening direction. This rotation of the pin 20 causes the connecting shaft 14 to rotate in the opposite direction to the tightening direction, and together with this, the box bit 15 also rotates in the same direction, so that the biting between the box bit 15 and the bolt 25 is released.

At the same time, the second cylinder 1 as shown in FIG.
7 is activated, and the guide sleeve 19 moves forward relative to the connecting shaft 14. Therefore, the guide hole 19b of the guide sleeve 19 around the connecting shaft 14 is located further on the forward movement side, and the guide portion 14c of the connecting shaft 14 does not match the guide hole 19b of the guide sleeve 19 and is held in a free state. The connecting shaft 14 and the box bit 15 can maintain an inclined posture when the bolts are fitted.

Therefore, when the driver stand 6 returns further and the box bit 15 separates from the head of the bolt 25, the connecting shaft 14 and the box bit 15 will not be damaged, and the box bit 15 will not be damaged in any way. The bolt 25 can be smoothly removed from the bolt 25 without being damaged.

[Effect of idea]

As explained above, the present invention configures the connecting shaft for centering the drive bit that rotates in response to the rotation of the rotary drive source to be retractable with respect to the guide sleeve, and the guide portion is configured to be retractable relative to the guide sleeve. In addition, the guide sleeve is configured to be able to move forward relative to the connecting shaft, so even if there is a misalignment between the drive bit and the component, the drive bit will fit into the component and the component will be securely tightened. Not only can this be done, but when the drive bit returns after tightening,
There are advantages in that the connecting shaft and the drive bit will not be broken, the drive bit can be smoothly removed from the component, the drive bit will not be damaged, and there will be no damage to the component.

[Brief explanation of the drawing]

FIG. 1 is an explanatory sectional view of a main part of the present invention, FIG. 2 is an enlarged sectional view of a main part showing the operating state of the present invention, and FIG. 3 is a sectional view of a main part of a conventional example. 1... Base, 2... Table, 3... Spacer, 4... Linear rail, 5a, 5b... Linear bearing, 6... Driver stand, 7... Mounting tool,
8... First cylinder, 8a... Rod, 9... Rotation drive source, 10... Gear case, 11... Gear mechanism, 11a... Intermediate shaft, 12... Grooved sleeve,
13... Guide groove, 13a... Straight groove, 13b...
... inclined groove, 14 ... connecting shaft, 14a ... large diameter part,
14b...Small diameter part, 14c...Guiding part, 14d...
...Tapered portion, 15...Box bit, 15a...
...Box hole, 16...Mounting plate, 17...
...Second cylinder, 17a...Rod, 18...Connection rod, 19...Guide sleeve, 19a...
Tapered hole, 19b...Guide hole, 20...Pin, 2
1... Spring, 22... Mounting tool, 23... Sensor,
24...Work, 25...Bolt, 31...First
Guide sleeve, 32...second guide sleeve,
32a...Tapered hole, 32b...Guide hole, 33...
…Spacer.

Claims (1)

[Claims for Utility Model Registration] A driver stand 6 and a guide sleeve 19, which move forward together by the operation of the first cylinder 8, are arranged, and a rotary drive source 9 is fixed to this driver stand 6, and is integrated with the drive shaft thereof. A grooved sleeve 12 is arranged to rotate, and the grooved sleeve 12 is positioned within the guide sleeve 19, while a connecting shaft 14 is connected to the grooved sleeve 12 so as to be movable in its axial direction. The pin 20 implanted in the connecting shaft 14 is positioned within the groove of the guide 13 of the grooved sleeve 12, and the connecting shaft 14 is moved forward by a spring 21. In an automatic parts fastening machine, a grooved sleeve 12 and a connecting shaft 14 are integrally connected so as to be rotatable and relatively movable, and a drive bit is connected to one end of this connecting shaft 14. are connected by the second cylinder 17 so that the distance between them can be extended, while the connecting shaft 14 is loosely inserted into the grooved sleeve 12,
One end of this connecting shaft 14 is composed of a guide portion 14c and a small diameter portion 14b continuous thereto, this guiding portion 14c is positioned at a position where it is guided by the guide sleeve 19, and the guiding distance of this guiding portion 14c is 14. An automatic parts fastening machine characterized by being configured to be shorter than the retraction distance of the first cylinder 14, and further comprising an air control circuit for operating the second cylinder 17 when the first cylinder 8 moves backward.